Method of producing compound cast bearings



29, 1942. F. BIEDERMANN 2,297,385

METHOD OF PRODUCING COMPOUND GAST BEARINGS Filed Feb'. '5, 1940 I n' MafI Patented Sept. 299, y1942 METHOD 0F APltODUCYINGr COMPOUND CASTBEARINGS Felix Biedermann, Berlin-Weissensee, Germany;

vested in the Alien Property Custodian Application-February 3, 1940,Serial No. 317,207

Germany February 3, 1939 3 Claims. (Cl. 29-149.5)

nearly continuous production of compound cast bearings is obtained whichsavestime and individual work and therefore renders cheap themanufacture of such bearings. The forming by the bending operationreplaces the otherwise required expensive finish of the steel blank tobe lined which is characterized by a large consumption of material and alarge removal of metal by cutting. Such methods, however, are rathercomplicated and in particular are not adapted tobe used, i1' bearingmetal alloys, for instance lead bronzes, are to be treated which fromthe standpoint of casting technique offer great difcultles, because thesteel and the alloy may be welded together under certain condition only.whereas harmful segregations cannot be prevented. Moreover, in thismanner at the best half bearing boxes only may be produced.

Methods for the manufacture of bearings by internally lining cylindricaltubes are known according to which a tube provided Vat the upper air islowered into the melt, whereupon the melt, i. e. first of all borax andthen bronze, are drawn in by vacuum. The excess metal is then pressedout again, whereby eventually a core may be introduced. Thecompound-cast bodies produced in this manner are then eventually bydividing further treated to obtain a plurality of bearing boxes. For aproduction on a large scale this method', however, is not very welladapted, be-

end with supply means for suction or compressed formed as a vessel ofone piece. In thisn manner the known lining of compound cast bearings inan uprightl mold may be carried out without using a'special mold or anyother additional device Which affects the cooling. In particular castingis effected without the use of a sand grain or the like as lowerclosure. The blank in this manner may very simply be treated in a mannerknown per se with a fiuxing agent.

Other objects and advantages tion will be apparent during the course ofthe following description. In the acompanying drawing, forming a part ofthis specification, and in which likeL numerals are employed todesignate like parts throughout the same,

Figure 1 is a sectional View of several steel blanks arranged to receivemolten bearing metal in accordance with the invention,

Figure 2 is a sectional viewlof a blank having a mandrel insertedtherein to force out the excess bearing metal,

Figure 3 is a sectional view of the steel blank lined with thebearingmetal at the completion of the operation shown in Figure 2,

Figure 4 is asectional view of the bearing with y and the steel blankobtained in this manner is chilled `inwater as quickly as possible. The

cause it is rather complicated and requires al produced which arefree'of the above mentioned.

drawbacks.

To obtain the object aimed at according to the invention, a specialblank is used which is of exactly or nearly exactly the desired shape,for instance cylindrical, Aof the supporting portion.

the wall of the bearing portion desired later on,' I allowing the mostsimple manufacture of the --'iihe blank, moreover, is from the beginning55 body onalarg'e scale.

superuous bearing metal, however, may also be removed in a suitablemanner after cooling.

Then for the production of a bearing ring as seen in Figure 4 the bottom5 is `severed. For the production of half bearing boxes the blank isonce more subdivided as seen in Figure 5, so

that by a corresponding forming two halves A and B of the desired radiusare directly obtained.

-A blank according to the invention for the supporting box may beproduced in the usual manner. According to one modiiication of theinvention chiplessly deformed, particularly drawn bodies. are used. 'Theoperation vmay be startedby using a sheet metal of nearly the thicknessof of the inven- An essential advantage of the present inventionconsists in avoiding any substantal defor-` mation of the cast blank inspite of the production on a large scale. The defonnation of compoundcast plates to bearing portions must, as is quite evident, have aharmful effect upon the quality of the finished bearing portion, ashereby the structure as well as the connection of the linecl bearingmaterial is affected.

It is to be understood that the form of the invention, herewith shownand described, is to be taken as a preferred example of the same. andthat various changes in the shape, size and arrangement of parts may beresorted to withthe scope of the subjoined claims.

What I claim is:

1. In a method of the character described, v

the lining is bonded to the blank and cool, severing the bottom of theblank and the portion of the bearing blank which lines the bottom of theblank and thus producing a bearing ring.

blank with the exception of a portion thereof forming a lining for theblank, then after the fusible metal is bonded to the blank and cool,removing the bottom of the blank and the portion of the bearing metalwhich lies said bottom and thus producing a bearing ring.

3. -In a method of the character described, placing a cup-shaped steelblank in an upright position, illiing said blank with fusible bearingmetal in molten condition, subsequently heating the blank and thebearing metal contained therein, electing all of the bearing metal fromthe blank with the exception of a portion thereof forming a lining forthe blank, then after bottom and thus producing a bearing ring, and

ilnally cutting the bearing ring lengthwise thereof and thereby forminghalf bearing boxes.

FELIX BIEDERMANN.

